Telegraph-monitoring system



Oct. 22, 1929. D. E. BRANSON 1,732,255vv TELEGRAPH MONITORING SYSTEM Filed Dec. 16, 1927 2 sums-sheet 1 INVENTOR. ZZZ/ 480 ATTORNEY J J U i v m Q V a v L mm. ,P

Oct; 22, 1929. D. E; BRANSON 1,732,255

TELEGRAPH MONITORING SYSTEM Filed Dec. 16, 1927 2 Sheets-Sheet 2 INVENTOR. flz'amow ATTORNEY Patented Oct. 22, 1929 UNITED STATES PATENT OFFICE DAVID E. BRANSON, OF RIVER EDGE, NEW JERSEY, ASSIGNOR TO AMERIGAN TELE- PHONE AND TELEGRAPH COMPANY, A CORPORATION OF NEW YORK TELEGRAPH-MONITORING SYSTEM Application filed December 16, 1327. Serial No. 240,478.

This invention relates to telegraph systems and more particularly to improved monitoring arrangements for use with the repeater apparatus of such systems.

I An oflice at the terminal of a telegraph system will include racks whichwill hold a plurality of terminal repeaters. It has been the practice in the past to provide each of these repeaters with individual monitoring.

equipment, whereby an attendant may send or receive signals through the repeater or make desirable current measurements therein. It is the primary purpose of the arrange ments of this invention to provide a monitoring arrangement which may be common to a plurality of repeaters at a terminal office. Such an arrangement of common monitoring would have great advantages over a system of individual monitoring in respect to a large saving in equipment. Other features and advantages ofthe invention will appear more fully from the detailed description hereinafter given.

The invention may be more fully understood from the following description together with the accompanying drawing in the Figures 1 and 20f which the invention is illustrated. Fig. 1 is a circuit diagram of a-metallic terminal telegraph repeater. In Fig. 2 is shown a circuit diagram of a common monitoring set which may be utilized with the terminal repeater of Fig. 1.

In Fig. 1 is shown the circuit of a terminal metallic repeater of the balanced loop type.

- The repeater includes the line L and the line receiving relay 1, the sending relays 3, the break relay 2, the switching keys K K,, K, and K and in addition connections to the noise killer device 4 and the balancing net work N It also includes a number of sending and receiving batteries to be described later and the line balancingjacks J and the jacks J 2 and J whereby con: nections may be established with themonitoring set. The circuit of the monitoring set of Fig. 2 includes jacksJ, and J It also includes the loop meter shunts 5 and6 and the meter '7. There is also shown a telegraph sending key 8 connected to a local sending relay 9,'a line sunder10 and a loop sounder 11. There are provided four switching keys K K K and K incidental to the operation of the monitoring set. A s

ing set. For this purpose key K will bev thrown up, key K left normal and key K thrown down. The circuits may be traced as follows: from battery 21, upper right hand contact of key K conductor 22, contact of relay 1, conductor 23, contact of keyK conductor 24, conductor 25, tip contacts of jacks J and J conductors 26 and 27, upper right hand contact of key K conductor 28, through line sounder 10, upper left hand contact of key K over conductor 29 to ground. This circuit will control the operation of the sounder in the monitoring set. The above traced circuit may be extended as follows: from conductor 26, through the line meter shunt 6, conductor 35, contact of keyK conductor 34, sleeve contacts of jacks J 5 and J conductor 33, upper right hand contact of key K conductor 32, left hand contact of key K and thence over the subscribers receiving loop 31 to battery 30. This circuit will operate the sounder in the subscribers loop 31.

With the above described circuits closed a reading may be taken by meter shunt 6 and meter 7 when key K, is operated down. This reading will give a measurement of the receiving loop current.

To measure the bias of the received or incoming signals the keys K and K would be thrown down. The above traced circuit from the armature of the receiving relay 1 would be completed from conductor 26 as follows: meter shunt 6, conductor 35, conductor 37 contact of key K,, conductor 38, and right hand contact of key K to ground. through resistance 80. Under the above conditions a reading of meter'7 and meter shunt 6 will indicate the bias of the received signals.

When the subscriber wishes to send signals conductors/ 47! and 48 will connect thesending batteries 49. and 50' to the conductors 51 and 52; theconductors 53 and 54, and thence to the side's 'of'line L to transmit signals thereover. At the same time current may betransmitted over a circuit in"v parallel with conductors 51 and 52; This circuit comprises conductors and 61, ring contacts of jacks J J ,;J and J winding'of-loopi'sounderill and conductor 62; I Accordingly the transmittedsi-gnals will'be heardon'the monitoring set by the loop sounder'll.

To measure the bias inthe transmitted signals the key K, will be left in'norma'l pos-ition; The above'traced'circuit to loop sound er 11' may be 'extendedby'a' shunt or lea'k circuit comprising'conductors 63 and 64, contacts of key K and loop meter 7. The lo'op'meter 7 will then indicate the bias in the transmitted signals; 5

The key K is termed; the cutting key. When it is in normal position the received signals will pass through the repeater both to the subscriber"s'loop and to' the sounder'in the monitoring'set as has been pointed out heretofore. The sendingloop iscon'ne'cted to the repeater so thatsignals-originating in that loop will be repeated to line L. When the cutting key K is thrown to a downwardposi tion" the loops are cut off from the repeater and the monitoringarrangements may be used for communication with the line; Unden this condition'it is still possible for the subscriber to send signals in the loop locallyiwithoutba ingtransmitted to the line L.

When the cutting key K is thrown to"=its upward position it opens the conductors 51 and 52, and hence disconnects the sending relay armatures from the line'-L, thereby preventing signals'from being transmittedto' the line L from the loop. Signals willberecord' ed to the loop Sounderll unclen'this'condition. Also the receiving relay circuit and conductor 23 will be openedrat key K to prevent signals from'the linegoing tothe subscriber:

The process of'sending from the monitoring set is as follows: Signals are sent from the that it is capable of embodiment in many and other widely varied forms without departing fromthe spirit of theinvention as defined by the appended claims.

What? isi cla'imed is: I

ll A telegraphsta'tion comprising aplural it yof'rep'eater sets of the terminal type, each of said repeater sets including" individual transmitting circuits and individual receiving circuits, a single monitoring set common to a plurality of repeater sets, and switching means whereby each of said tra'nsmittin'g circans and receiving circuits may be individual- 1y extended into said common monit'oringset;

A telegraph station including arepeater set ofthe terminal type, said repeater' set hav ingatransmitting circuit and receiving circuit, aanonitoring set, switching means in said repeater setian d said monitoring setwhereby said transmit-ting circuit and said receiving circuit may be extended into saidmonitor-ing set, and signal responsive means in-said cir cuit's'as extended intosaid m'o'n'itoring'set.

3. A= telegraph station including arep'eater setof the terminal type, said repeater set having" a transmitting-circuit an'd'a receiV-ing circuit, a monitoring set, switching means insaid repeater set and said'monitoring set whereby said transmitting circuit and said" receiving circuitmaybe extended into said monitor-ing set signal responsive means and current measuring" devices in said monitoringset, and switching means in said'monitoring set where by said'signal'responsive means andsaid current' measuring devicesmay be selectively associated with said circuits as-extended therein.

4. A telegraph'station including arepeater setof the terminal=type, said-repeaterset liaving a transmitting circuit and a receiving circuit, transmitting means in saidtr'ansmitting circuit, a monitoring set, switching means in said repeater set and said monitoring set whereby said" transmitting circuit and said receiving? circuit may be extended. into; said monitoring-set, and me'ans-in s'aid monit'oring set whereby said transmitting means be actuated.

5'. A telegraph station-including a repeater set ofthe ter-minal type, said repeat'er set having a transmitting circuit and a-receiving circuit, and a monitoring set, said repeater set and 'said'monitoring set each includingswitching means and a set of six conductors where by said transmitting circuit and said? re'eeiv ing circuit may be individually extended into said monitoring set.

6. A telegraph station including a repeater set of the terminal type, said repeater set having a transmitting circuit and a receiving circuit, a line circuit, a cutting key Whereby said circuits may be selectively associated with said line circuit, a monitoring set, and switching means whereby said transmitting and receiving circuits may be individually extended into said monitoring set.

In testimony whereof, I have signed my name to this specification this 16th day of December, 1927.

DAVID E. BRANSON. 

